It's a 4-pole unit built for distribution duty in switchboards and panelboards, rated to EN/IEC 60947-2. The TM-D trip gives you fixed thermal overload protection (L) and fixed magnetic short-circuit protection (I) — no adjustment dials, which means one less thing to accidentally get bumped during commissioning.
For reference, at 220/240 V it jumps to 85 kA Icu. So if your service entrance feeds a 415 V bus with available fault current under 36 kA, this breaker holds. If you're coordinating downstream of a transformer with higher prospective fault current, you'll need to check the selectivity curves or step up to an H or L breaking capacity variant in the same NSX frame.
Mounts to a backplate — no DIN rail here. The 161 mm height, 140 mm width, and 86 mm depth fit standard NSX cutouts. Front connections top and bottom, with a 35 mm connection pitch. The toggle handle gives clear visual indication of the contact position, and the IP40 enclosure (IK07 impact rating) handles typical panel environments.
Rated for 20,000 mechanical operations and 20,000 electrical cycles at 440 V at rated current (In). At half load (In/2) at 440 V, that doubles to 20,000 electrical cycles. That's typical for a distribution MCCB — not a switching device for frequent motor starts, but fine for infrequent isolation and fault protection in a panel.